Rotary pump



April 12, 1932. s. KARASICK 1,854,157

ROTARY- PUMP Filed Nov. 15, 1929 2 Sheets-Sheet 1 E; l 3 OUTLET INLET gwumatoz 51 5mm a l Kara 515k April 12, 1932. s. KARASICK 1,854,157

ROTARY PUMP Filed Nov. 15, 1929 2 Sheets-Sheet 2 Ea-rrL-LLQ'L Kai" 55113111- Patented Apr. 12, 1932 UNITED STATES PATENr-o Fi-cr.

SAMUEL KARASICK, OF MOUNT VERNON, NIEVT. YORK ROTARY PU P Application filed November 13, 1929. Serial No. 406,823.

duce a pump of this type which is effective lib mounted.

in operation,-simpl e in construction and relatively inexpensive'to manufacture.

The novel features of the invention w1ll appear from the detailed description and appendedclai-ms when taken with the drawings in which 'Fig. 1 is a vertical cross-sectional view on line 11 of Fig. 2 while Flg. 2 1s a vertical crosssectional view taken on the line'22-of Fig. 1; Fig. 3 is a detailed view -ofthe rotary rocking-member; and Flg. 4111121,- grammatically represents a different position-of the rotary piston in a different portion of its-cycle.

Referring to the-drawings, 5 designates a cylindrical chamber having its ends closed by the end plates 6 and-7. These end plates have recesses to receive ball-"bearing supports 8 an'd 9 in which a driving shaft 10 actuated from any suitable source of power,- is Theend plate 7 is also provided with an 'elongated-portion 1 1 surrounding the driving shaftwhich serves as a stuffing box, 'housingtwoannular members 12 and 13 adjustable-with respect-to each other (by means not -'shown) 1 to compress stuffing material 14 to prevent leakage-of air around the shaft. On the shaft 10 there is securedbykeys such as '15, a holloweccentric member 16 on which the rotary piston 17 rotates so that successive portions of its periphery progressively engage'the walls ofthe interior ofthe chamber. Thecylindricalchamber5 is formed with an extension or sector-shaped compartment generally designated '18 w'hich is provided with an :inlet 19 for the supply-of air to bee hausted or compressed and which houses a rockingarm generally designated'29.

This --'arm having an opening 20 is proface 3'3 malres air-Ztig'htaengagement with a '26 controlled by segmental pin 44 likewise'having an arcuate surface which pin is mounted ina recess in the wall of the compartment to "facilitate assembling of the pump. The right hand surface of this arm 29 (Fig. 1)' is arcuate to conform to the general curvatureqof the periphery of the piston so that this-surface may engage a substantial portion of the piston surface during a material'portion of its operation. ing arm so thatas the piston rotates, thearm rocks from a position slightlyto the left of that shown in Fig. 1 to the position shown in '5. The connection between the :piston and the valve member includes a rod25 pass ing through an annular member 22yfastened by pins 23 in a recess in the piston .and

through apertured ears 2 1 secured to the rocking arm. This arm makes air-tight engage- The piston 17 is linked to'therock- *60 ment with member 22 and the'piston to which l 0 it is connected except when opening20 in'the arm is in registry with the cut out portion or valve 341 of member 22 a Which'time' the compartment 18 communicates with the chamber 5. In additionto this intake, thechamber 5, 275

as shown in Fig. 1, is provided with an outlet a spring-actuated valve 27 and valve seat 28.

In the operation of the pump, at thebeginning of the cycle as shownin Fig. 1,there is a certain amount of air in the :chamber 5 WhlCll-llLS been admitted 'thereto through the rocking arm 29 and valve 34 duringitheprevious cycle. As the rotary piston'l'? is .rotated bythe shaft 10 and the eccentric mem- 'ber 16 carried thereby, successive portions of the piston 17 engage the inside of'thechamher 5- and compress the air therein during successive portions of the cycle until the ,pressure of this imprisoned air overcomes'theresistence of the valve 27 whereupon this air is ejected through this valve.

As the piston rotates from the position shown in Fig. 1 it draws the arm 29 toward the right until its arcuate side surface and a portion of the wall of the chamber are engaged by a portion of the piston surface, thereafter the piston moves toward the right with the arm 29 following it although the piston gradually advances more rapidly than the arm 29 so that the passage through openings 20 and 34 is gradually brought into registry as shown in Fig. 5. When the piston reaches a point slightly to the right of that shown in Fig. 5, it begins to force the arm 29 toward the left until it closes the passage through openings 20 and 34, at which time, the elements will have reached the position shown in Fig. 1 completing the cycle of operation.

While the pump of this disclosure will operate in any position, it has been found to function most satisfactorily when mounted on the legs B of Fig. 1 with the inlet extending vertically. This superior operation is believed to be due to the fact that a better oil seal is obtained with the pump in the last mentioned position.

A water jacket or other means for dissipa ing heat developed in the larger types of pumps, has been omitted for simplifying the disclosure but it will be understood that such heat dissipating means will be utilized around the walls of the piston chambers and other heated areas of the pumps. While the pump of this invention has been particularly described as a vacuum pump it will be understood that it is also adapted as a compressor or as a pump for liquids such as water and the like.

The present disclosure is for purposes of illustration only and there may be many modifications and variations thereof within the scope of the following claims without departing from the spirit of the present invention.

What I claim is:

1. In a rotary pump, a closed cylindrical chamber, a rotary piston eccentrically mounted for rotation within said chamber so that portions thereof progressively engage the chamber walls during operation, a compartment formed as an extension of said cylindrical chamber, and a rocking arm articulating in a groove in the wall of said compartment and pivotally connected to said piston whereby said rocking arm effects communication between said compartment and said chamber in certain positions only of said piston.

2. In a rotary pump, a closed cylindrical chamber, a rotary piston eccentrically mounted for rotation within said chamber so that portions thereof progressively engage the chamber walls during operation, a compartment formed as an extension of said cylindrical chamber, and a rocking member articulating in a groove in the wall of said compartment and pivotally connected to said piston to close said opening, said rocking member having an opening therein eifect-ing connection between said compartment and said cham her in certain positions only of said member and said piston.

3. In a rotary pump, a closed cylindrical chamber, a rotary piston eccentrically mounted for rotation in said chamber so that portions thereof progressively engage the chamber walls, saio piston being provided with an extension, a compartment opening into said chamber, a rocking member having one end pivoted in the walls of said compartment and its other end pivotally connected to said e2;- tension whereby the opening between said compartment and said chamber is closed, said member and said extension each having an opening therein arranged to be brought in registry with each other in certain positions of said piston whereby a passage is completed between said compartment and said chamber.

In a rotary pump, a. closed cylindrical chamber, a rotary piston eccentrically mounted for rotation within said chamber so that portions thereof progressively engage the chamber walls, an extension on said piston, a sector-shaped compartment opening into said cylindrical chamber, and a sector-shaped member having its narrow portion pivoted in the walls of said compartment and its arcuate surface engaging an arcuate portion of said compartment wall to close the opening between said chamber and said compartment, said extension being pivotally connected to said member at a point remote from its pivotal mounting, said member and said extension being each provided with openings arranged to be brought into registry with each other in certain positions of said piston whereby a passage is completed between said compartment and said chamber.

5. In a rotary pump, a closed cylindrical chamber, a rotary piston eccentrically mounted for rotation within said chamber so that portions thereof progressively engage the chamber walls, an extension on said piston, a sector-shaped compartment opening into said cylindrical chamber, and a sector-shaped member having its narrow portion pivoted in the walls of said compartment and its arcuate surface engaging an arcuate wall of said compartment to close the opening between said chamber and said compartment, said extension being pivotally connected to said member at a point remote from its pivotal mounting, said member and said extension being provided with openings arranged to be brought in registry with each other in certain positions of said piston whereby a passage is completed between said compartment and said chamber, said passage being open during the major portion of the cycle of said piston.

6. In a rotary pump, a closed cylindrical chamber, a rotary piston eccentrically mounted for rotation within said chamber so that portions thereof progressively engage the chamber walls, an extension on said piston, a sector-shaped compartment opening into said cylindrical chamber, a sector-shaped member having its narrow portion pivoted in the walls of said compartment and its arcuate surface engaging an arcuate wall of v said compartment to close the opening between said chamber and said compartment, said extension being pivotally connected to said member at a point remote from its pivotal mounting, said member and said extension being provided with openings arranged to be brought into registry with each other in certain positions of said piston whereby a passage is completed between said compartment and said chamber, said passage being closed during that portion of the cycle of said piston while it is progressively engaging a point near the outlet of said passage to a point adjacent the pivot of said member.

7. In a rotary pump, a closed cylindrical chamber, a rotary piston eccentrically mounted for rotation within said chamber so that portions thereof progressively engage the chamber walls during operation, a compartment adjacent said cylindrical chamber, and a rocking member having one end pivoted in the walls of said compartment and its other end pivotally connected to said piston whereby said member rocks into and out of engagement with said piston to efiect communication between said compartment and said chamber in certain positions only of said piston.

8. In a rotary pump, a closed cylindrical chamber, a rotary piston eccentrically mounted for rotation within said chamber so that portions thereof progressively engage the chamber walls durin operation, a compartment opening into said cylindrical chamber, a rocking member closing said opening and provided with an arcuate side, said member having one end pivoted in the walls of said compartment and its other end pivotally connected to said piston whereby the arcuate side of said member rocks into rotary engagement with said piston, and a passage through said rocking member effecting connection between said compartment and said chamber in certain positions only of said member and said piston.

9. In a rotary pump, a closed cylindrical chamber, a rotary piston eccentrically mounted for rotation within said chamber so that portions thereof progressively engage the chamber walls, an extension on said piston, a compartment opening into said cylindrical chamber, and a sector-shaped member having an arcuate top surface and an arcuate side surface, said member having its narrow portion pivoted in the walls of said compartment and its arcuate top surface engaging an arcuate wall of said compartment to close the opening between said chamber and said compartment, said extension being pivotally connected to said member at a point remote from its pivotal mounting, whereby said arcuate side surface and said piston move into and out of engagement, said member and said extension being provided with openings arranged to be brought in registry with each other when said side surface and said piston are out of engagement whereby a passage is completed between said compartment and said chamber, said passage being open during the major portion of the cycle of said piston.

10. In a rotary pump, a closed cylindrical chamber, a rotary piston eccentrically mounted for rotation within said chamber so that portions thereof progressively engage the chamber walls, an extension on said piston, a compartment opening into said cylindrical chamber, and a sector-shaped member provided with an arcuate top surface andan arcuate side surface, said member having its narrow portion pivoted in the walls of said compartment and its arcuate top surface engaging an arcuate wall of said compartment to close the opening between said chamber and said compartment, said extension being pivotally connected to said member at a point remote from its pivotal mounting whereby the arcuate side surface of said member and said piston rotate into and out of engagement, said member and said extension being provided with openings arranged to be brought into registry with each other in certain positions of said piston whereby a passage is completed between said compartment and said chamber, said passage being closed during that portion of the cycle of said piston while it is progressively engaging said chamber wall at a point near the outlet of said passage and while it is in engagement with said arcuate side surface.

In witness whereof, I hereunto subscribe my name this 12 day of November, A. D. 1929.

SAMUEL KARASICK. 

